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Run Bookinfo with Kubernetes Deploy the Bookinfo application that uses the ratings microservice in Kubernetes. 30

{{< boilerplate work-in-progress >}}

This module shows you an application composed of four microservices written in different programming languages: productpage, details, ratings and reviews. We call the composed application Bookinfo, and you can learn more about it in the Bookinfo example page.

The version of the application used in the example can be viewed as the final version since the reviews microservice has three versions: v1, v2, v3.

In this module, the application only uses the v1 version of the reviews microservice. The next modules enhance the application with multiple versions of the reviews microservice.

Deploy the application and a testing pod

  1. Set the value of the NAMESPACE environmental variable to tutorial:

    {{< text bash >}} $ export NAMESPACE=tutorial {{< /text >}}

  2. Set the value of the KUBECONFIG environmental variable to the path of file you created in the previous module:

    {{< text bash >}} export KUBECONFIG=./{NAMESPACE}-user-config.yaml {{< /text >}}

  3. Set the MYHOST environmental variable to hold the URL of the application:

    {{< text bash >}} export MYHOST=(kubectl config view -o jsonpath={.contexts..namespace}).bookinfo.com {{< /text >}}

  4. Skim [bookinfo.yaml]({{< github_blob >}}/samples/bookinfo/platform/kube/bookinfo.yaml). This is the Kubernetes deployment spec of the app. Notice the services and the deployments.

  5. Deploy the application to your Kubernetes cluster on the tutorial namespace:

    {{< text bash >}} $ kubectl apply -l version!=v2,version!=v3 -f {{< github_file >}}/samples/bookinfo/platform/kube/bookinfo.yaml service "details" created deployment "details-v1" created service "ratings" created deployment "ratings-v1" created service "reviews" created deployment "reviews-v1" created service "productpage" created deployment "productpage-v1" created {{< /text >}}

  6. Check the status of the pods:

    {{< text bash >}} $ kubectl get pods NAME READY STATUS RESTARTS AGE details-v1-6d86fd9949-q8rrf 1/1 Running 0 10s productpage-v1-c9965499-tjdjx 1/1 Running 0 8s ratings-v1-7bf577cb77-pq9kg 1/1 Running 0 9s reviews-v1-77c65dc5c6-kjvxs 1/1 Running 0 9s {{< /text >}}

  7. After the four services achieve the Running status, you can scale the deployment. To let each version of each microservice run in three pods, execute the following command:

    {{< text bash >}} $ kubectl scale deployments --all --replicas 3 deployment "details-v1" scaled deployment "productpage-v1" scaled deployment "ratings-v1" scaled deployment "reviews-v1" scaled deployment "reviews-v2" scaled deployment "reviews-v3" scaled {{< /text >}}

  8. Check the pods status. Notice that each microservice has three pods:

    {{< text bash >}} $ kubectl get pods NAME READY STATUS RESTARTS AGE details-v1-6d86fd9949-fr59p 1/1 Running 0 50s details-v1-6d86fd9949-mksv7 1/1 Running 0 50s details-v1-6d86fd9949-q8rrf 1/1 Running 0 1m productpage-v1-c9965499-hwhcn 1/1 Running 0 50s productpage-v1-c9965499-nccwq 1/1 Running 0 50s productpage-v1-c9965499-tjdjx 1/1 Running 0 1m ratings-v1-7bf577cb77-cbdsg 1/1 Running 0 50s ratings-v1-7bf577cb77-cz6jm 1/1 Running 0 50s ratings-v1-7bf577cb77-pq9kg 1/1 Running 0 1m reviews-v1-77c65dc5c6-5wt8g 1/1 Running 0 49s reviews-v1-77c65dc5c6-kjvxs 1/1 Running 0 1m reviews-v1-77c65dc5c6-r55tl 1/1 Running 0 49s {{< /text >}}

  9. Deploy a testing pod, [sleep]({{< github_tree >}}/samples/sleep), to use it for sending requests to your microservices:

    {{< text bash >}} $ kubectl apply -f {{< github_file >}}/samples/sleep/sleep.yaml {{< /text >}}

  10. To confirm that the Bookinfo application is running, send a request to it with a curl command from your testing pod:

    {{< text bash >}} kubectl exec -it(kubectl get pod -l app=sleep -o jsonpath='{.items[0].metadata.name}') -c sleep -- curl productpage:9080/productpage | grep -o ""

    {{< /text >}}

Enable external access to the application

Once your application is running, enable clients from outside the cluster to access it. Such clients are known as mesh-external clients. Once you configure the steps below successfully, you can access the application from your laptop's browser.

{{< warning >}}

If your cluster runs on GKE, change the productpage service type to LoadBalancer before you create your Kubernetes ingress, as shown in this example:

{{< text yaml >}} selector: app: productpage sessionAffinity: None type: LoadBalancer {{< /text >}}

{{< /warning >}}

Configure the Kubernetes Ingress resource and access your application's webpage

  1. Create a Kubernetes Ingress resource:

    {{< text bash >}} $ kubectl apply -f - <<EOF apiVersion: extensions/v1beta1 kind: Ingress metadata: name: bookinfo spec: rules:

    • host: $MYHOST http: paths:
      • path: /productpage backend: serviceName: productpage servicePort: 9080
      • path: /login backend: serviceName: productpage servicePort: 9080
      • path: /logout backend: serviceName: productpage servicePort: 9080 EOF {{< /text >}}

Update your /etc/hosts configuration file

  1. Append the output of the following command to /etc/hosts. You should have a Superuser privilege and probably use sudo to run the command.

    {{< text bash >}} echo(kubectl get ingress istio-system -n istio-system -o jsonpath='{..ip} {..host}') $(kubectl get ingress bookinfo -o jsonpath='{..host}') {{< /text >}}

Access your application

  1. Access the application's home page from the command line:

    {{< text bash >}} $ curl -s $MYHOST/productpage | grep -o ""

    {{< /text >}}

  2. Paste the output of the following command in your browser address bar:

    {{< text bash >}} $ echo http://$MYHOST/productpage {{< /text >}}

    You should see the following webpage:

    {{< image width="80%" link="bookinfo.png" caption="Bookinfo Web Application" >}}

  3. Observe how microservices call each other. For example, reviews calls the ratings microservice using the http://ratings:9080/ratings URL. See the [code of reviews]({{< github_blob >}}/samples/bookinfo/src/reviews/reviews-application/src/main/java/application/rest/LibertyRestEndpoint.java):

    {{< text java >}} private final static String ratings_service = "http://ratings:9080/ratings"; {{< /text >}}

  4. Set an infinite loop in a separate terminal window to send traffic to your application to simulate the constant user traffic in the real world:

    {{< text bash >}} $ while :; do curl -s $MYHOST/productpage | grep -o ""; sleep 1; done

    ... {{< /text >}}

You are ready to test the application.